You can obtain all the geometric data from the name itself.
The airofoil name 63-121 was given. .The NACA 63121 profile describes an airfoil with design lift coefficient of 0.9 (0.15*6), the point of maximum camber located at 15% chord (5*3), reflex camber, and maximum thickness of 21% of chord length (21).
Other details are irrelevant
visit http://airfoiltools.com/airfoil/naca5digit for more information.
Answered with a tutorial: https://grabcad.com/tutorials/how-can-i-get-the-coordinate-data-from-an-airfoil-graphics
AttachmentsThe NACA airfoil series.pdf, 276 KB
Thanks, Abhilash P. I did as you said, but what i get is NACA 63-121 AIRFOIL instead of 63-621 which is what i want. Is 121 and 621 the same one? They seem not similar. Waiting for your message
Sorry,that was a mistake. Airofoils 63121 and 63621 are different.... The 5 digit nomenclature is applicable only for lower order, for higher orders the parameter 0.15 may vary.Go through the attachment for further details
Use a pencil and a graph and work out the Integration and differentiation of the curve. This will give you precise data, or photocopy and import into drawing app with 1:1 scale, depending on software just import or trace
Feature -> Curves -> Curve Through XYZ Points
You can browse Curves: *sldcrv; *txt
Also you can entered manually.
i know that. what i want is the opposite process: i get a picture of graph, and i want to know the coordinate data in that graph.
Thank you everyone including Abhilash P,Lukasz Siwiec and Duncan. i have figure the problem out using the software named"plot digitizer". everyone can download it free. it can solve our problem. again thanks everyone and share the software with u.